MySql乱码的问题

今天,做一个Demo.程序用utf-8,mySql数据库用utf-8,但是插进去的数据还是乱码.
解决方法如下:

<bean id="dataSource"
        class="com.mchange.v2.c3p0.ComboPooledDataSource"
        destroy-method="close">
        <property name="driverClass" value="com.mysql.jdbc.Driver" />
        <property name="jdbcUrl"
            value="jdbc:mysql://127.0.0.1:3306/mydata?useUnicode=true&amp;characterEncoding=utf-8"/>
        <property name="user" value="root" />
        <property name="password" value="root" />
        <property name="autoCommitOnClose" value="true" />
        <property name="checkoutTimeout" value="5000" />
        <property name="initialPoolSize" value="2" />
        <property name="minPoolSize" value="2" />
        <property name="maxPoolSize" value="4" />
        <property name="maxIdleTime" value="25200" />
        <property name="acquireIncrement" value="1800" />
        <property name="maxIdleTimeExcessConnections" value="5" />
    </bean>